# ext/autohandler.py # Copyright (C) 2006-2012 the Mako authors and contributors # # This module is part of Mako and is released under # the MIT License: http://www.opensource.org/licenses/mit-license.php """adds autohandler functionality to Mako templates. requires that the TemplateLookup class is used with templates. usage: <%! from mako.ext.autohandler import autohandler %> <%inherit file="${autohandler(template, context)}"/> or with custom autohandler filename: <%! from mako.ext.autohandler import autohandler %> <%inherit file="${autohandler(template, context, name='somefilename')}"/> """ import posixpath, os, re def autohandler(template, context, name='autohandler'): lookup = context.lookup _template_uri = template.module._template_uri if not lookup.filesystem_checks: try: return lookup._uri_cache[(autohandler, _template_uri, name)] except KeyError: pass tokens = re.findall(r'([^/]+)', posixpath.dirname(_template_uri)) + [name] while len(tokens): path = '/' + '/'.join(tokens) if path != _template_uri and _file_exists(lookup, path): if not lookup.filesystem_checks: return lookup._uri_cache.setdefault( (autohandler, _template_uri, name), path) else: return path if len(tokens) == 1: break tokens[-2:] = [name] if not lookup.filesystem_checks: return lookup._uri_cache.setdefault( (autohandler, _template_uri, name), None) else: return None def _file_exists(lookup, path): psub = re.sub(r'^/', '',path) for d in lookup.directories: if os.path.exists(d + '/' + psub): return True else: return False